Portable display device



FIG. 1 is a front, right side, perspective view of a portable display device showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view.

The broken lines indicate unclaimed portion of the article that form no part of the claimed design. 

CLAIM The ornamental design for a portable display device, as shown and described. 